EP1079250A2 - Light coupled device - Google Patents
Light coupled device Download PDFInfo
- Publication number
- EP1079250A2 EP1079250A2 EP00118000A EP00118000A EP1079250A2 EP 1079250 A2 EP1079250 A2 EP 1079250A2 EP 00118000 A EP00118000 A EP 00118000A EP 00118000 A EP00118000 A EP 00118000A EP 1079250 A2 EP1079250 A2 EP 1079250A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- light
- couplings
- insulating
- coupled device
- coupling section
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 230000008878 coupling Effects 0.000 claims abstract description 105
- 238000010168 coupling process Methods 0.000 claims abstract description 105
- 238000005859 coupling reaction Methods 0.000 claims abstract description 105
- 229920002050 silicone resin Polymers 0.000 claims description 20
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 12
- 239000000945 filler Substances 0.000 claims description 7
- 229920001721 polyimide Polymers 0.000 claims description 5
- 239000000853 adhesive Substances 0.000 claims description 3
- 230000001070 adhesive effect Effects 0.000 claims description 3
- 238000010276 construction Methods 0.000 abstract description 16
- 230000003287 optical effect Effects 0.000 abstract description 6
- 230000005540 biological transmission Effects 0.000 abstract description 3
- 239000003822 epoxy resin Substances 0.000 description 6
- 229920000647 polyepoxide Polymers 0.000 description 6
- 238000000034 method Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/12—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof structurally associated with, e.g. formed in or on a common substrate with, one or more electric light sources, e.g. electroluminescent light sources, and electrically or optically coupled thereto
- H01L31/16—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof structurally associated with, e.g. formed in or on a common substrate with, one or more electric light sources, e.g. electroluminescent light sources, and electrically or optically coupled thereto the semiconductor device sensitive to radiation being controlled by the light source or sources
- H01L31/167—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof structurally associated with, e.g. formed in or on a common substrate with, one or more electric light sources, e.g. electroluminescent light sources, and electrically or optically coupled thereto the semiconductor device sensitive to radiation being controlled by the light source or sources the light sources and the devices sensitive to radiation all being semiconductor devices characterised by potential barriers
Definitions
- the present invention relates to a light coupled device such as a 2-channel photocoupler having a plurality of light couplings.
- a signal transmitting interface in factory automation equipment or the like requires electrical insulation from external devices, and besides is used in an environment filled with influence of external noise, and accordingly a photocoupler is used as the signal transmitting interface.
- the photocoupler used in the interface must have a high-speed performance (high-speed signal transmission), and a plurality of photocouplers are required since the interface has a plurality of inputs and outputs.
- multi-channel type light coupled devices are used, each of which includes a plurality of light couplings in one package.
- Figs. 4A through 4C show an outward appearance of a conventional multi-channel type light coupled device, in which Fig. 4A is a front view, Fig. 4B a side view and Fig. 4C a plan view.
- Fig. 5 is a view showing an interconnection in the light coupled device shown in Figs. 4A through 4C.
- Fig. 6 shows a layout of a lead frame on the light receiving side as shown in Fig. 5.
- the 2-channel type light coupled device shown in Figs. 4A through 4C, 5 and 6 employs light receiving elements each having a photodiode and a light signal processing circuit integrated into a single chip by bipolar IC process.
- Each light receiving element acting as an element on the output (or secondary) side, has three external connectors, i.e. a source voltage terminal Vcc, a GND terminal and an output terminal Vo.
- two light receiving elements 2A and 2B are provided. Since the two light receiving elements can share the source voltage terminal Vcc and GND terminal, a connecting method may be employed therefor, as shown in Fig.
- each of the light receiving elements 2A and 2B has three terminals to make a total of six terminals on the secondary side (output side)
- the result will be a 12-pin package.
- the number of terminals on the secondary side will be four, which provides a simplified package having only eight pins as shown in Fig. 4.
- a light coupled device with a plurality of light couplings generally, has some of the terminals shared by the light receiving elements in order to achieve compactness and low cost of the product.
- each light emitting element and an associated light receiving element have a transparent silicone resin filled therebetween to form a light coupling which is sealed with an epoxy resin.
- a transparent silicone resin filled therebetween to form a light coupling which is sealed with an epoxy resin.
- Fig. 7 is a sectional view schematically showing light coupled sections of a conventional multi-channel type light coupled device.
- adjacent light couplings 24 are formed of a transparent silicone resin.
- Light emitted from each light emitting element 1 passes through a light coupling 24 formed of the transparent silicone resin, and directly reaches the opposite light receiving element 2.
- Part of the light from the light emitting element 1 is reflected from the boundary between the silicone resin and an adjoining epoxy resin 25 to reach the light receiving element 2.
- the epoxy resin 25 filled between the two light couplings 24 formed of the transparent silicone resin plays a role of blocking light transmission between the channels so that light emitted from the light emitting element 1 of one channel is prevented from reaching the light receiving element 2 of the other, adjacent channel, in order to avoid an interference of light signals (hereinafter referred to as "crosstalk") between the two light couplings 24.
- the two-channel type light coupled device shown in Fig. 5 requires a construction in which signals inputted to input terminals T1 and T2 result in a signal outputted from an output terminal T7, while signals inputted to input terminals T3 and T4 result in a signal outputted from an output terminal T6.
- each light coupling 24 shown in Fig. 7 must be formed of the transparent silicone resin, and the two adjacent light couplings 24 must be spaced apart to be out of contact with each other. This requirement has been a limitational factor in an area saving designing of lead frame size and downsizing (volume saving) of packages.
- the present invention has been made having regard to the state of the noted above, and its object is to provide a multichannel type light coupled device with a construction for enabling an area saving designing of lead frame size and downsizing (volume saving) of packages.
- a light coupled device comprising a plurality of light couplings and an insulating and light shielding element disposed between the light couplings arranged adjacent each other.
- the light coupled device prevents crosstalk since the insulating and light shielding element blocks light transmission between the adjacent light couplings.
- This construction compared with the conventional construction (Fig. 7), realizes a reduced distance between the adjacent light couplings.
- the insulating and light shielding element used in the light coupled device according to the invention may comprise a polyimide film or silica glass sheet with a light shielding color applied thereto.
- a light shield may be effected between the adjacent light couplings by using an insulating and light shielding polyimide film or silica glass sheet. Even though the light couplings are arranged close together, no crosstalk will occur therebetween.
- projections or recesses are formed on/in a lead frame on which the light couplings are mounted, for fixing the insulating and light shielding element to a predetermined position between the light couplings.
- the light shielding element does not become displaced when a transparent silicone resin is injected to form the light couplings. Consequently, the light shielding element may be fixed to an optimal position in the middle between the adjacent light couplings.
- the insulating and light shielding element is fixed by an adhesive to the lead frame on which the light couplings are mounted.
- the insulating and light shielding element may be fixed to the lead frame by using an adhesive such as an epoxy resin, instead of the projections or recesses. With this measure also, the insulating and light shielding element may be fixed to the optimal position in the middle between the adjacent light couplings.
- a light coupled device comprising a plurality of light couplings, each of the light couplings including, at least, a primary light coupling section and a secondary light coupling section formed of a light transmitting filler around a light emitting element on a primary side and a light receiving element on a secondary side of the light coupled device, and an insulating and light transmitting element disposed between the primary light coupling section and the secondary light coupling section for optically interconnecting the primary light coupling section and the secondary light coupling section.
- the light transmitting filler may be a transparent silicone resin.
- the primary and secondary light coupling sections are formed of a transparent silicone resin around the light emitting element on the primary side and the light receiving element on the secondary side, respectively, the primary light coupling section and the secondary light coupling section being optically interconnected through an insulating and light transmitting element, the primary light coupling section, the secondary light coupling section and the insulating and light transmitting element constituting each of the light couplings.
- the primary light coupling section and secondary light coupling section formed of a light transmitting filler such as a transparent silicone resin are optically interconnected through the insulating and light transmitting element.
- This construction realizes an optical path of reduced volume, compared with a case where each light coupling is formed only of a light transmitting filler such as a transparent silicone resin. A sufficient distance is secured between the light couplings for preventing crosstalk therebetween even though the lead frames are reduced in size.
- the light couplings may be arranged closer together than in the conventional construction (Fig. 7).
- the insulating and light transmitting element used in the light coupled device according to the invention may comprise a silica glass sheet.
- the insulating and light transmitting element is not limited to a particular shape, but may be cylindrical, spherical or cubic, for example.
- the primary light coupling section and secondary light coupling section may be optically interconnected by using a silica glass sheet, which realizes an optical path of reduced volume, compared with a case of forming each light coupling only of the light transmitting filler.
- a silica glass sheet which realizes an optical path of reduced volume, compared with a case of forming each light coupling only of the light transmitting filler.
- the primary light coupling section and secondary light coupling section may be optically interconnected in a uniform way, to realize an optical path of reduced volume.
- Fig. 1 is a sectional view schematically showing light couplings of a light coupled device in Embodiment 1 of the invention.
- the light coupled device shown in Fig. 1 is a 2-channel type photocoupler similar to that shown in Fig. 7.
- This device includes two pairs of light emitting elements 1 consisting of light emitting diodes and light receiving elements 2 consisting of light receiving diodes mounted on lead frames 3 to be opposed to each other.
- a transparent silicone resin is filled between each pair of light emitting element 1 and light receiving element 2 to act as a light coupling 4.
- the light coupled device in this example is characterized by an insulating and light shielding film 5 disposed between the two adjacent light couplings 4, i.e. in a middle position of the light couplings 4 seen as a whole.
- This film 5 is formed by applying a light shielding color to a polyimide film.
- the insulating and light shielding film 5 isolates the two light couplings 4 from each other so that no light is transmitted from one to the other. Thus, even though the two light couplings 4 are arranged close together, no crosstalk will occur therebetween.
- Embodiment 1 employs, as an insulating and light shielding element, the insulating and light shielding film 5 formed by applying a light shielding color to a polyimide film.
- the film 5 a silica glass sheet with a light shielding color applied thereto may be disposed between the two light couplings 4 to produce a similar effect.
- Fig. 2 is a sectional view schematically showing light couplings of a light coupled device in Embodiment 2 of the invention.
- Embodiment 2 shown in Fig. 2 is characterized by an addition to the construction shown in Fig. 1 of projections 31 formed on the lead frame 3 associated with the light receiving elements 2, for positioning and fixing the insulating and light shielding film 5 between the two adjacent light couplings 4, i.e. in the middle position of the light couplings 4 seen as a whole.
- projections 31 are effective to prevent the light shielding film 5 becoming displaced when the transparent silicone resin is injected to form the light couplings 4. Consequently, the light shielding film 5 may be fixed to an optimal position in the middle between the light couplings 4.
- the projections 31 may be replaced with positioning and fixing recesses formed in the lead frame 3. Instead of forming the projections or recesses, the light shielding film 5 may be fixed to the lead frame 3 by means of an epoxy resin.
- the construction for fixing the insulating film 5 with the projections, recesses or epoxy resin described above is applicable where a silica glass sheet or the like with a light shielding color applied thereto is used.
- Fig. 3 is a sectional view schematically showing light couplings of a light coupled device in Embodiment 3 of the invention.
- the light coupled device shown in Fig. 3 is a 2-channel type photocoupler having two pairs of light emitting elements 1 (light emitting diodes) and light receiving elements 2 (light receiving diodes) mounted on lead frames 3 to be opposed to each other.
- a primary light coupling section 6 and a secondary light coupling section 7 are formed of a transparent silicone resin around each light emitting element 1 on the primary side and each light receiving element 2 on the secondary side.
- the primary light coupling section 6 and secondary light coupling section 7 are optically interconnected through a cylindrical silica glass element 8 (insulating and light transmitting element).
- the primary light coupling section 6, secondary light coupling section 7 and silica glass element 8 constitute a light coupling 14.
- each light coupling were formed only of the silicone resin, without the interposition of an insulating and light transmitting element, variations in viscosity of the silicone resin would destabilize the formation.
- a relatively large margin is required in the distance between the light couplings to accommodate possible dimensional inaccuracies of the light couplings formed of the silicone resin.
- the light coupled device in Embodiment 3 reduces variations of the silicone resin forming the primary light coupling sections 6 and secondary light coupling sections 7, thereby allowing the light couplings 14 to have a slim configuration as shown in Fig. 3.
- a sufficient distance is secured for preventing crosstalk even though the adjacent light couplings are arranged with a reduced distance therebetween and the lead frames 3 are reduced in size.
- the silica glass elements used in Embodiment 3 may be spherical, cubic or otherwise, apart from being cylindrical.
- a light coupled device has an insulating and light shielding element disposed between adjacent light couplings.
- the light shielding element allows the light couplings to be arranged close to each other while preventing crosstalk occurring therebetween. This construction achieves a reduction in package size and a reduced area for mounting.
- Another type of light coupled device has a primary light coupling section and a secondary light coupling section formed of a transparent silicone resin around each light emitting element on the primary side and each light receiving element on the secondary side.
- the primary light coupling section and secondary light coupling section are optically interconnected through an insulating and light transmitting element. This construction realizes optical paths of reduced volume. Thus, a sufficient distance is secured for preventing crosstalk even where adjacent light couplings are arranged with a reduced distance therebetween, thereby achieving a reduction in package size and a reduced area for mounting.
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- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- Photo Coupler, Interrupter, Optical-To-Optical Conversion Devices (AREA)
Abstract
Description
Claims (9)
- A light coupled device comprising:a plurality of light couplings (4); andan insulating and light shielding element (5) disposed between the light couplings (4) arranged adjacent each other.
- The light coupled device of claim 1, wherein the insulating and light shielding element (5) comprises a polyimide film with a light shielding color applied thereto.
- The light coupled device of claim 1, wherein the insulating and light shielding element (5) comprises a silica glass sheet with a light shielding color applied thereto.
- The light coupled device of claim 1, wherein projections (31) or recesses are formed on/in a lead frame (3) on which the light couplings (4) are mounted, for fixing the insulating and light shielding element (5) to a predetermined position between the light couplings (4).
- The light coupled device of claim 1, wherein the insulating and light shielding element (5) is fixed by an adhesive to the lead frame (3) on which the light couplings are mounted.
- A light coupled device comprising:a plurality of light couplings (4),each of the light couplings (4) including, at least,a primary light coupling section (6) and a secondary light coupling section (7) formed of a light transmitting filler around a light emitting element (1) on a primary side and a light receiving element (2) on a secondary side of the light coupled device, andan insulating and light transmitting element (5) disposed between the primary light coupling section (6) and the secondary light coupling section (7) for optically interconnecting the primary light coupling section (6) and the secondary light coupling section (7)
- The light coupled device of claim 6, wherein the light transmitting filler is a transparent silicone resin.
- The light coupled device of claim 6, wherein the insulating and light transmitting element (5) comprises silica glass.
- The light coupled device of claim 6, wherein the insulating and light transmitting element (5) is of a cylindrical, spherical or cubic shape.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP23564499A JP3676136B2 (en) | 1999-08-23 | 1999-08-23 | Optical coupling element |
JP23564499 | 1999-08-23 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1079250A2 true EP1079250A2 (en) | 2001-02-28 |
EP1079250A3 EP1079250A3 (en) | 2004-02-11 |
EP1079250B1 EP1079250B1 (en) | 2007-10-17 |
Family
ID=16989079
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00118000A Expired - Lifetime EP1079250B1 (en) | 1999-08-23 | 2000-08-22 | Light coupled device |
Country Status (5)
Country | Link |
---|---|
US (1) | US6507048B1 (en) |
EP (1) | EP1079250B1 (en) |
JP (1) | JP3676136B2 (en) |
DE (1) | DE60036762T2 (en) |
TW (1) | TWI223458B (en) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2004006753A (en) * | 2002-04-05 | 2004-01-08 | Canon Inc | Package for optical semiconductor |
JP2006038572A (en) * | 2004-07-26 | 2006-02-09 | Sharp Corp | Reflection type encoder and electronic apparatus using this reflection type encoder |
JP5019799B2 (en) * | 2006-06-15 | 2012-09-05 | シャープ株式会社 | Optical coupling element, electronic device, and method of manufacturing optical coupling element |
US9472536B2 (en) | 2011-10-11 | 2016-10-18 | Kabushiki Kaisha Toshiba | Semiconductor device and method for manufacturing the same |
JP5649547B2 (en) | 2011-10-11 | 2015-01-07 | 株式会社東芝 | Manufacturing method of semiconductor device |
JP2013197302A (en) * | 2012-03-19 | 2013-09-30 | Toshiba Corp | Semiconductor device and manufacturing method therefor |
US11299466B2 (en) | 2016-04-12 | 2022-04-12 | Lg Chem, Ltd. | Compound, and organic electronic element comprising same |
CN116093095B (en) * | 2022-12-14 | 2024-06-14 | 莱弗利科技(苏州)有限公司 | Optocoupler isolator and packaging process thereof |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1309938A (en) * | 1969-09-26 | 1973-03-14 | Siemens Ag | Optical-electronic semiconductor devices |
US4291943A (en) * | 1977-08-05 | 1981-09-29 | Minnesota Mining And Manufacturing Company | Connector for optical fiber cables |
US4612670A (en) * | 1984-05-16 | 1986-09-16 | General Dynamics Corporation | Electro-optical connection between electronic modules |
US4712862A (en) * | 1986-08-27 | 1987-12-15 | Rca Corporation | Optical fiber connector and method of assembling same |
US5148243A (en) * | 1985-06-25 | 1992-09-15 | Hewlett-Packard Company | Optical isolator with encapsulation |
JPH09307135A (en) * | 1996-05-17 | 1997-11-28 | Toshiba Corp | Optical composite element |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59177978A (en) * | 1983-03-26 | 1984-10-08 | Nec Corp | Multichannel type semiconductor optical coupler |
JPH0479380A (en) * | 1990-07-23 | 1992-03-12 | Nec Corp | Multi-channel photo coupler |
JPH05251731A (en) | 1992-03-09 | 1993-09-28 | Sharp Corp | Optically coupled device and primary metal mold to be used for the device |
JP2600616B2 (en) * | 1994-09-08 | 1997-04-16 | 日本電気株式会社 | Optical coupling device |
JP3401128B2 (en) | 1995-09-25 | 2003-04-28 | シャープ株式会社 | Method for manufacturing multi-channel optical coupling device |
JPH09205223A (en) | 1995-11-24 | 1997-08-05 | Denso Corp | Semiconductor device |
-
1999
- 1999-08-23 JP JP23564499A patent/JP3676136B2/en not_active Expired - Fee Related
-
2000
- 2000-08-22 TW TW089117307A patent/TWI223458B/en not_active IP Right Cessation
- 2000-08-22 DE DE60036762T patent/DE60036762T2/en not_active Expired - Fee Related
- 2000-08-22 EP EP00118000A patent/EP1079250B1/en not_active Expired - Lifetime
- 2000-08-23 US US09/643,905 patent/US6507048B1/en not_active Expired - Fee Related
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1309938A (en) * | 1969-09-26 | 1973-03-14 | Siemens Ag | Optical-electronic semiconductor devices |
US4291943A (en) * | 1977-08-05 | 1981-09-29 | Minnesota Mining And Manufacturing Company | Connector for optical fiber cables |
US4612670A (en) * | 1984-05-16 | 1986-09-16 | General Dynamics Corporation | Electro-optical connection between electronic modules |
US5148243A (en) * | 1985-06-25 | 1992-09-15 | Hewlett-Packard Company | Optical isolator with encapsulation |
US4712862A (en) * | 1986-08-27 | 1987-12-15 | Rca Corporation | Optical fiber connector and method of assembling same |
JPH09307135A (en) * | 1996-05-17 | 1997-11-28 | Toshiba Corp | Optical composite element |
Non-Patent Citations (1)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 1998, no. 03, 27 February 1998 (1998-02-27) -& JP 09 307135 A (TOSHIBA CORP), 28 November 1997 (1997-11-28) * |
Also Published As
Publication number | Publication date |
---|---|
EP1079250B1 (en) | 2007-10-17 |
DE60036762D1 (en) | 2007-11-29 |
US6507048B1 (en) | 2003-01-14 |
JP2001060714A (en) | 2001-03-06 |
DE60036762T2 (en) | 2008-07-24 |
EP1079250A3 (en) | 2004-02-11 |
JP3676136B2 (en) | 2005-07-27 |
TWI223458B (en) | 2004-11-01 |
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